A clockwork theory

Giudice, Gian F.; McCullough, Matthew

doi:10.1007/jhep02(2017)036

Cited by 205 publications

(400 citation statements)

References 60 publications

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“…We will now input some extra information about the spectrum, which will be enough to show that the model of [27] cannot be consistently embedded in the present setup, at least for parametrically large Z. We will also see that the Clockwork mechanism [34][35][36][37][38][39], which for our purposes here is essentially N successive Higgsings, is also constrained, since the charges Z i of each step are constrained, and N is constrained as well. One of the typical uses of the Clockwork is the dynamical generation of tiny gauge couplings in a natural way, since we roughly have g IR ∼ g UV /Z N .…”

Section: Clockworkmentioning

confidence: 96%

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A note on the WGC, effective field theory and clockwork within string theory

Ibáñez

Montero

2018

J. High Energ. Phys.

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It has been recently argued that Higgsing of theories with U(1) n gauge interactions consistent with the Weak Gravity Conjecture (WGC) may lead to effective field theories parametrically violating WGC constraints. The minimal examples typically involve Higgs scalars with a large charge with respect to a U(1) (e.g. charges (Z, 1) in U(1) 2 with Z ≫ 1). This type of Higgs multiplets play also a key role in clockwork U(1) theories. We study these issues in the context of heterotic string theory and find that, even if there is no new physics at the standard magnetic WGC scale Λ ∼ g IR M P , the string scale is just slightly above, at a scale ∼ √ k IR Λ. Here k IR is the level of the IR U(1) worldsheet current. We show that, unlike the standard magnetic cutoff, this bound is insensitive to subsequent Higgsing. One may argue that this constraint gives rise to no bound at the effective field theory level since k IR is model dependent and in general unknown. However there is an additional constraint to be taken into account, which is that the Higgsing scalars with large charge Z should be part of the string massless spectrum, which becomes an upper bound k IR ≤ k 2 0 , where k 0 is the level of the UV currents. Thus, for fixed k 0 , Z cannot be made parametrically large. The upper bound on the charges Z leads to limitations on the size and structure of hierarchies in an iterated U(1) clockwork mechanism.

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Section: Clockworkmentioning

confidence: 96%

“…This is the clockwork mechanism of refs. [34][35][36][37][38][39] applied to Abelian gauge interactions. If we were successful in embedding such a model into the heterotic string, the suppression would be bounded as 5) so that there is only supression if α i 16M 2 S /M 2 p .…”

Section: Jhep02(2018)057mentioning

confidence: 99%

A note on the WGC, effective field theory and clockwork within string theory

Ibáñez

Montero

2018

J. High Energ. Phys.

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“…. N ), similarly to [4], together with a single right-handed chiral fermion R 0 . We thus have the following set of (2N + 1) chiral fields…”

Section: Clockwork Dark Mattermentioning

confidence: 99%

“…The lightest state is (essentially) the Majorana particle ∼ R 0 , but it communicates to the SM through a chain of (relatively heavy, with respect to the hopping scale m) particles, which, as in ref. [4], we dub "clockwork gears" in the sequel.…”

Section: Jhep07(2017)047mentioning

confidence: 99%

“…In the following we propose that, along a clockwork mechanism [2][3][4][5][6][7], a DM particle could be made accidentally stable but have a decay into SM particles induced by order unity interactions with particles that could be produced at colliders. Such a clockwork mechanism does not prevent the DM to undergo fast annihilations into SM particles (or…”

Section: Introductionmentioning

confidence: 99%

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A clockwork WIMP

Hambye

Teresi

Tytgat

2017

J. High Energ. Phys.

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We embed a thermal dark matter (DM) candidate within the clockwork framework. This mechanism allows to stabilize the DM particle over cosmological time because it suppresses its decay into Standard Model (SM) particles. At the same time, pair annihilations are unsuppressed, so that the relic density is set by the usual freeze-out of the DM particle from the thermal bath. The slow decay of the DM candidate is induced by "clockwork" particles that can be quite light (rather than at some GUT or Planck scale) and could be searched for at current or future colliders. According to the scenario considered, the very same particles also mediate the annihilation process, thus providing a connection between DM annihilation and DM decay, and fixing the mass scale of the clockwork states, otherwise unconstrained, to be in the TeV range or lighter. We then show how this setup can minimally emerge from the deconstruction of an extra dimension in flat spacetime. Finally, we argue that the clockwork mechanism that we consider could induce Majorana neutrino masses, with a seesaw scale of order TeV or less and Yukawa couplings of order unity.

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Pixelated Dark Energy

Heckman

Lawrie

Lin

et al. 2019

Fortschritte der Physik

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We study the phenomenology of a recent string construction with a quantum mechanically stable dark energy. A mild supersymmetry protects the vacuum energy but also allows O(10−100) TeV scale superpartner masses. The construction is holographic in the sense that the 4D spacetime is generated from “spacetime pixels” originating from five‐branes wrapped over metastable five‐cycles of the compactification. The cosmological constant scales as Λ∼1/N in the pixel number. An instability in the construction leads to cosmic expansion. This also causes more five‐branes to wind up in the geometry, leading to a slowly decreasing cosmological constant which we interpret as an epoch of inflation followed by (pre‐)heating when a rare event occurs in which the number of pixels increases by an order one fraction. The sudden appearance of radiation triggers an exponential increase in the number of pixels. Dark energy has a time varying equation of state with wa=−3normalΩm,0false(1+w0false)/2, which is compatible with current bounds, and could be constrained further by future data releases. The pixelated nature of the Universe also implies a large‐l cutoff on the angular power spectrum of cosmological observables with l max ∼Ofalse(Nfalse). We also use this pixel description to study the thermodynamics of de Sitter space, finding rough agreement with effective field theory considerations.

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A clockwork theory

Cited by 205 publications

References 60 publications

A note on the WGC, effective field theory and clockwork within string theory

A note on the WGC, effective field theory and clockwork within string theory

A clockwork WIMP

Pixelated Dark Energy

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